package com.heima.wemedia.filter;

import com.heima.wemedia.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        //得到resp requ
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //判断是否是登录请求
        if (request.getURI().getPath().contains("/login")){
            //放行
            return chain.filter(exchange);
        }

        //获取token
        String token = request.getHeaders().getFirst("token");

        //5. 判断token是否存在
        if (StringUtils.isBlank(token)){
            //不存在返回
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //6. 存在检验是否过期
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            int result = AppJwtUtil.verifyToken(claimsBody);
            if (result ==1 || result == 2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return  response.setComplete();
            }
            //token没问题，拿到里面存放的用户id（登录时存放到id里面的）
            String id= claimsBody.get("id")+ ""; //强转为string
            //把用户id放到请求头里面
            ServerHttpRequest shr = request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId", id);
            }).build();

            //重置请求
            exchange.mutate().request(shr);
        } catch (Exception e) {
            e.printStackTrace();
        }
        //如果token没问题放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
